my 1994 k1500 5.7 chevy suburban service engine soon has been coming on.....took it to advance auto for computer check....i was told it was the egr valve can i put sheet metal under it to block it off and disconnect the vacuum line....or just disconnect the vacuum line...or should i just replace the egr valve....i was told they make a screen for some models but, i don't think they make one for mine....it has been drinking the gas....can anyone help me with this problem......p.s. i have also taken it off a cleaned it but it doesn't last very long..